Indoor Positioning System Using LiFi Based Network for Mobile Robots

LiFi is a communication technology that enables wireless transmission of data using light. With mobile robots finding more and more indoor applications in hospitals, museums, airports etc., indoor localisation has become all the more essential. This paper aims to demonstrate the functioning of a LiFi based localization system by the means of simulation. The mathematical time series model of NRZ-OOK modulation and the optical power distribution are prepared in MATLAB in order to evaluate the functioning of the proposed system. To validate and test the performance of the same, a white LED of wavelength 550nm is set-up as the transmitter in our system and simulated using the Optisystem software, both with and without the presence of ambient light noise. A maximum speed of 10Gbps with a BER (Bit Error Rate) of 5.15585×10
⁻¹¹
is achieved for a link range of 1m in ideal conditions. This work also proposes an optimal filtering scheme that provides a high Q factor and a low BER for VLC (Visible Light Communication) systems, even in the presence of ambient light noise.